Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

This memorial to a family's dead son has survived a century of hurricanes and earthquakes.

Built some 700 years ago, this Taíno ceremonial site features ball courts, petroglyphs, and evidence of ancient astronomy practices.

The world's second largest single-dish radio telescope, once used to contact E.T.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

This niche museum devoted to ancient religious artifacts is shaped like the very thing it displays.

This giant bronze image of Christopher Columbus embarked on a voyage of its own.

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

This "sausage route" features gorgeous views and family-owned restaurants.

Enjoy the waters of this half-moon-shaped natural pool surrounded by breathtaking scenery.

Archaeological sites and great food inside the island's largest mangrove forest.

The ruins of the first Spanish settlement in Puerto Rico.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This tiny home was originally a narrow alleyway.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

This colorful gate stands as an entrance to the walled city of Old San Juan.

This small fort played a huge role defending Puerto Rico’s capital city.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.